Update from Editor Peter Sciretta: The Back to the Future-inspired Nike MAG sneakers are now available on nikemag.ebay.com. The sneakers are being released in a limited edition and auctioned to benefit The Michael J. Fox Foundation. After the jump you can watch a commercial for the promotion directed by Back to the Future series producer (and second unit director) Frank Marshall and starring Bill Hader and Kevin Durant. I wish I could get my hands on a pair of these sneakers, but the auctions have already ballooned into the thousands within the first few minutes.